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The most popular sport balloons are approximately 55 feet wide (diameter) and 70 feet high, which is about the same as a 7-story building. There is 1,075 square yards of nylon fabric in its envelope (or one-fifth of an acre in surface area), more than three miles of thread, and almost one-half mile of nylon webbing (used for reinforcing). Its 77,550 cubic foot air capacity displaces almost three tons of air and can hold 62,279 bushels of apples or 579,340 gallons of water. Sport balloons usually carry three to four people. (Bea Peterson photo)
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